WorksheetsEcology MidTerm Ver II
Total questions: 40
Worksheet time: 3hrs 20mins
Groups of different species that live together in a defined area make up a(an)
community
ecosystem
Autotrophs are organisms that
rely on other organisms for their energy and food supply.
use energy they take in from the environment to convert inorganic molecules into complex organic molecules.
When an ecosystem is limited by a single nutrient that either is scarce or cycles very slowly, this substance is called a(an)
biogeochemical cycle
limiting nutrient/limiting factor
The average, year-after-year conditions of temperature and precipitation within a particular region are its
climate
biotic factors
Examples of biotic components of a pond include (pick all that apply):
fish
algae
amount of sunlight
A type of symbiosis in which one organism benefits and the other is harmed is called
parasitism
succession
A form of symbiosis in which both organisms benefit is called
mutualism
commensalism
A type of symbiosis in which one organism is helped and another organism is neither helped nor hurt is called
mutualism
commensalism
Natural disturbances, such as fire or hurricanes, can result in
competition
secondary succession
Coral reefs are made out of 2 closely associated species: coral polyp which is an animal that consumes zooplankton and uses sugars made by the algae zooxanthellae through photosynthesis. This is an example of of:
mutualism
commensalism
What is the role of decomposers within an ecosystem (pick all that apply)?
Decomposers make water and sugars available to plants.
Decomposers break down organic material to return nutrients back into the ecosystem.
Decomposers are important in the recycling of nutrients in the biogeochemical cycles.
What is niche?
the role that an organism plays within an ecosystem.
what the organism eats.
What is the efficiency of energy transfer between trophic levels of an ecological pyramid or a food chain?
10% since majority of the energy consumed is used up by the organism.
25% since this is the amount that is stored in the cells and tissues of the organism.
Individual sunflowers of the same species living at the same place at the same time is:
a population
a community
Abiotic components of a pond include (pick all that apply):
sun
water weeds
water
Which of the following will most likely happen to a predator population if its prey population decreases?
there will be a decrease in the predator population over time
there will be an increase in the predator population over time
What do the arrows in a food chain represent?
The flow of energy
Renewable resource depletion
Lionfish are an invasive species to Floridian waters. They are a predator to juvenile fish populations that are trying to survive and grow to be adult fish. There are no natural predators to the lionfish. What would most likely happen as a result of the introduction of lionfish to these ecosystems?
Many fish populations will disappear
All fish species will increase
What do the rabbit and the snake have in common?
They share a common predator, the hawk.
They both eat the caterpillar.
What causes competition among organisms?
One organism tries to live on or in the other organism
Both organisms attempt to use the same limited resource
How do producers get their energy?
They capture energy from sunlight
They extract energy from the soil
What is biodiversity?
The degree of variation of life on Earth
The process of creating new species
What are survivorship curves?
curves that describe the number of survivors over time
a curve
What is the arrow pointing at?
carrying capacity
density dependent
the number of people in a defined area such as a square kilometre
population density
population
An S-shaped curve is known as
Logistic Graph
Graphs
the pattern or spread of people in a given area
population distribution
demographics
What type of population distribution is this?
Random
Clumped
Uniform
If r = population growth rate; b = birth rate; i = immigration rate; d= death rate; e = emigration rate, which of these equations most accurately describes population growth?
r = (b+i) - (d+e)
r = (b-e) + (d-i)
H2S + 6CO2 + 3O2 → C6H12O6 (carbohydrate) + 12H2O + 18S is the equation for:
chemosynthesis
photosynthesis
What is transpiration?
Water from the leaves of plants into the air
Condensation
Which of these is the first stage of the Nitrogen Cycle?
fixation
ammonification
What is the largest reservoir for nitrogen?
the atmosphere
bacteria
The two factors that determine what the biome is (pick only 2):
Climate
Geography/Topography
Weather
Which physical adaptation is favored in the Tundra
Plant life is limited to mosses, grasses, lichens, herbs and woody shrubs.Only small plants can live here due to the permafrost that does not permit deep root systems
Many plants also have underground stems, this helps them to survive fires
